JetSearch / Search in Media

code.php

<?php
add_filter( 'jet-search/tools/get-post-types', function( $post_types ) {
	$post_types['attachment'] = 'Media';

	return $post_types;
} );

add_filter( 'jet-search/ajax-search/query-args', function( $query ) {
	if ( in_array( 'attachment', $query['post_type'] ) ){
		$query['post_status'] = [ 'any' ];
	}
	
	return $query;
} );

add_filter( 'jet-search/ajax-search/thumbnail-html', function( $html, $post, $data ) {
	$size	= ! empty( $data['thumbnail_size'] ) ? $data['thumbnail_size'] : 'thumbnail';
	$img	= $post->post_type === 'attachment' ? wp_get_attachment_image( $post->ID, $size ) : '%s';
	$html	= '<div class="jet-ajax-search__item-thumbnail">' . $img . '</div>';

	return $html;
}, 10, 3 );

Works with JetSearch 3.5.11+